In the pale light of the tunnel, 30-foot fossil traces of lycopsid gleam slickly in the shale roof like alligator skins.

它们看起来一棵棵巨型的芦笋。在隧道内黯淡的灯光下，页岩顶部30英尺长的遗就皮般发出柔滑的光亮。